Search for B(s)0 - anti-B(s)0 oscillations and a measurement of B(d)0 - anti-B(d)0 oscillations using events with an inclusively reconstructed vertex

Neutral B meson oscillations in the B0_s - anti-B0_s and B0_d - anti-B0_d systems were studied using a sample of about 4.0 million hadronic Z decays recorded by the DELPHI detector between 1992 and 2000. Events with a high transverse momentum lepton were removed and a sample of 770 k events with an inclusively reconstructed vertex was selected. The mass difference between the two physical states in the B0_d - anti-B0_d system was measured to be: \Delta m_d = (0.531 +/- 0.025 (stat.) +/- 0.007 (syst.)) ps^{-1}. The following limit on the width difference of these states was also obtained: |\Delta\Gamma_{B_d}| / \Gamma_{B_d} < 0.18 at 95% CL. As no evidence for B0_s - anti-B0_s oscillations was found, a limit on the mass difference of the two physical states was given: \Delta m_s > 5.0 ps^{-1} at 95% CL. The corresponding sensitivity of this analysis is equal to 6.6 ps^{-1}.

Note:

37 pages, 15 figures, Accepted by Eur. Phys. J. C Report-no: CERN-EP-2002-078 Journal-ref: Eur. Phys. J. C 28 (2003) 155-173

electron positron: colliding beams
electron positron: annihilation
Z0: electroproduction
Z0: hadronic decay
bottom: pair production
B0 anti-B0: mixing
B0: mass difference
width: difference
B/s0 anti-B/s0: interference
B/s0: mass difference

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Figures(0)

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